<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!--卡片视图区域-->
    <el-card>
      <!--头部警告区-->
      <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！！" type="warning" :closable="false"></el-alert>

      <!--选择商品分类区-->
      <el-row class="cat_opt">
        <el-col>
          <span>商品分类：</span>
          <!--选择商品分类的级联选择框-->
          <el-cascader
            v-model="selectdeCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"></el-cascader>
        </el-col>
      </el-row>

      <!--tab 页签区-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--添加动态参数面板-->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled"
                     @click="addDialogVisible = true">添加参数</el-button>
          <!--动态参数表格-->
          <el-table :data="manyTableData" border stripe>
            <!--展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染tag标签-->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i"
                        closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                <!--输入文本框-->
                <el-input class="input-new-tag"
                  v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--添加按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!--索引列-->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini"
                           @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini"
                           @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!--添加静态属性面板-->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled"
                     @click="addDialogVisible = true">添加属性</el-button>
          <!--静态属性表格-->
          <el-table :data="onlyTableData" border stripe>
            <!--展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable
                        @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                <!--输入文本框-->
                <el-input class="input-new-tag"
                          v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                          ref="saveTagInput"
                          size="small"
                          @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--添加按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!--索引列-->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini"
                           @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini"
                           @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!--添加参数对话框-->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addFormClosed">
      <!--表单区-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <!--底部按钮区-->
      <span slot="footer" class="dialog-footer">
      <el-button @click="addDialogVisible = false">取 消</el-button>
      <el-button type="primary" @click="addParams">确 定</el-button>
    </span>
    </el-dialog>

    <!--修改参数对话框-->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editFormClosed">
      <!--表单区-->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <!--底部按钮区-->
      <span slot="footer" class="dialog-footer">
      <el-button @click="editDialogVisible = false">取 消</el-button>
      <el-button type="primary" @click="editParams">确 定</el-button>
    </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Params',
  data () {
    return {
      //  商品分类列表
      catelist: [],
      //  级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      //  级联选择框双向绑定的数组
      selectdeCateKeys: [],
      //  被激活页签名称
      activeName: 'many',
      //  动态参数数据
      manyTableData: [],
      //  静态属性数据
      onlyTableData: [],
      //  控制添加参数对话框的显示与隐藏
      addDialogVisible: false,
      //  添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      //  添加表单的验证规则
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      //  控制修改对话框的显示与隐藏
      editDialogVisible: false,
      //  修改的表单数据对象
      editForm: {
        attr_name: ''
      },
      //  修改表单的验证规则
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
      /*
      //  控制扩展列按钮与文本框的隐藏与显示
      inputVisible: false,
      //  扩展列文本框中输入的内容
      inputValue: ''
      */
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    //  获取所有的商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        //  请求失败
        return this.$message.error('获取商品列表失败！！')
      } else {
        //  请求成功
        this.catelist = res.data
        this.$message.success('获取商品列表成功！')
      }
    },
    //  级联选择框变化会触发这个函数
    handleChange () {
      this.getParamsData()
    },
    //  Tab页签点击事件的处理函数
    handleTabClick () {
      this.getParamsData()
    },
    //  获取参数的列表设置
    async getParamsData () {
      //  根据所选分类的id和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        //  请求失败
        return this.$message.error('获取参数列表失败！！')
      } else {
        res.data.forEach(item => {
          //  item.attr_vals是否为空，不为空就用空格分割，为空就返回一个空的数组
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          //  控制扩展列文本框的显示与隐藏
          item.inputVisible = false
          //  扩展列文本框中输入的值
          item.value = ''
        })
        /* console.log(res.data) */
        //  请求成功
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
        this.$message.success('获取参数列表成功！！')
      }
    },
    //  监听添加对话框的关闭事件
    addFormClosed () {
      this.$refs.addFormRef.resetFields()
    },
    //  点击按钮添加参数
    addParams () {
      //  预验证
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          //  没有通过预验证
          return this.$message.error('验证失败！！')
        } else {
          //  通过预验证
          const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 201) {
            //  请求失败
            return this.$message.error('添加参数失败！！')
          } else {
            //  请求成功
            this.$message.success('添加参数成功！')
            //  关闭对话框
            this.addDialogVisible = false
            //  刷新数据列表
            this.getParamsData()
          }
        }
      })
    },
    //  点击按钮展示修改对话框
    async showEditDialog (attrid) {
      //  查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrid}`, {
        params: { attr_sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        //  请求失败
        return this.$message.error('获取参数信息失败！！')
      } else {
        //  请求成功
        this.editForm = res.data
        this.$message.success('获取参数信息成功！')
      }
      this.editDialogVisible = true
    },
    //  监听编辑对话框的关闭，并清空
    editFormClosed () {
      this.$refs.editFormRef.resetFields()
    },
    //  点击按钮修改参数信息
    editParams () {
      //  预校验
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) {
          // 校验失败
          return this.$message.error('校验失败！！')
        } else {
          // 校验成功
          const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 200) {
            //  请求失败
            return this.$message.error('修改参数信息失败！！')
          } else {
            //  请求成功
            this.editForm = res.data
            this.$message.success('修改参数信息成功！')
            //  关闭对话框
            this.editDialogVisible = false
            //  刷新数据列表
            this.getParamsData()
          }
        }
      })
    },
    //  点击按钮删除参数信息
    async removeParams (attrid) {
      const confirmRes = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmRes !== 'confirm') {
        //  取消了删除的操作
        return this.$message.info('已取消删除！！')
      } else {
        //  确认了删除
        const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrid}`)
        if (res.meta.status !== 200) {
          //  请求失败
          return this.$message.error('删除失败！！')
        } else {
          //  请求成功
          this.$message.success('已删除！')
          //  刷新数据列表
          this.getParamsData()
        }
      }
    },
    //  扩展列文本框失去焦点或者按下enter键
    handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return this.$message.error('输入有误，请重新输入！！')
      } else {
        row.attr_vals.push(row.inputValue.trim())
        //  清空输入框
        row.inputValue = ''
        //  隐藏对话框
        row.inputVisible = false
        //  发起请求，保存操作
        this.saveAttrVals(row)
      }
    },
    //  点击扩展列按钮显示文本框
    showInput (row) {
      row.inputVisible = true
      //  让文本框自动获得焦点
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 将对attr_valus的操作保存到数据库
    async saveAttrVals (row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        //  请求失败
        return this.$message.error('保存失败！！')
      } else {
        //  请求成功
        this.$message.success('保存成功！')
      }
    },
    //  删除扩展列
    handleClosed (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    //  如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled () {
      if (this.selectdeCateKeys.length !== 3) {
        //  禁用按钮
        return true
      } else {
        return false
      }
    },
    //  当前选中的三级分类的ID
    cateId () {
      if (this.selectdeCateKeys.length === 3) {
        return this.selectdeCateKeys[2]
      } else {
        return null
      }
    },
    //  动态添加dialog标题
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
  margin: 15px 0;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
  width: 120px;
}
</style>
